eating out?

Basically I've been with my boyfriend for nearly 4 months and we have done most things and feel really comfortable around each other but whenever I ask or say I would find it hot if he eats me out he just laughs and says he will soon and he never has the nearest he's gone to eating me out is kissing my inner thigh like what? Should I bring it up with him seeming as sucking his dick is no problem why can't I have what I want as well